Hi Mike, we gave the annex a go at the weekend, its not a one man job and probably takes 10+ min. This wasn't helped by the fact that there were no instructions in the package but a bonus was that there was also the storage units included as well. Also we had to accommodate the Foxwing which was already deployed.
Anyway here are some pics of our first attempt.
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I'm not sure how it would perform in strong gusty winds and was surprised to find it was made of a plastic type materiel and not a canvas but it was ok. With a bit more time dedicated to its set up I'm sure it would look a bit less creased. I'm sure that the longer one stayed in one place the more use it would be.
The advantage we found was that we left boots downstairs, but we did only have it up for one night and it did add to the time packing up the next day.
On reflection, if you were using the top regularly and were stopping places more than one night I'd consider adding the annex to the top. All being well I'll be set up at the AO show so its there to see.
We didn't get the chance to get the tent awning tried this time so we'll have a go with that in the future.
BTW setting up the tent itself is literally a 15-45 sec job.
Hope this helps.